Electromagnetic wave absorbing properties of glucose‐derived carbon‐rich SiOC ceramics annealed at different temperatures

Abstract

A kind of glucose‐derived carbon‐rich silicon oxycarbide (glucose‐SiOC) nanocomposite with excellent electromagnetic wave absorbing performance is obtained via solvothermal method, and then pyrolyzed at high temperature (1300°C and 1400°C) under argon atmosphere. The structural evolutions and the electromagnetic wave absorbing capabilities of the nanocomposites have been systematically investigated. The resultant 3 mol/L glucose‐SiOC ceramic exhibits a heterostructure, in which nanosized glucose‐derived carbon and SiC particles decorate on amorphous SiOC network. Benefitting from the nanosized carbon, SiC particles and the heterostructure attributes, the 3 mol/L glucose‐SiOC ceramic displays a strong electromagnetic wave‐absorbing property. The minimum reflection coefficient of the 3 mol/L glucose‐SiOC ceramic pyrolyzed at 1400°C reaches −27.6 dB at 13.8 GHz. The widest effective absorption bandwidth attains 3.5 GHz in Kμ‐band. This work opens up a novel and simple route to fabricate polymer‐derived ceramics with excellent electromagnetic wave‐absorbing performance.

Enhanced electromagnetic wave absorption of Fe‐doped silicon oxycarbide nanocomposites

“…Figure summarizes the typical PDC‐based nanocomposites in terms of RL min values reported in the recent literatures . It can be seen that the PDC‐based absorbers are wildly investigated in recent years.…”

“…Figure 8 summarizes the typical PDC-based nanocomposites in terms of RL min values reported in the recent literatures. 47,[49][50][51][52][53][61][62][63][64][65][66][67][68] It can be seen that the PDC-based absorbers are wildly investigated in recent years. Both of these PDC-based absorbers have a narrow EAB.…”

“…49 Recently, there are many excellent reviews in the literature dealing with the basic issue including in situ growing SiC nanowires or particles, introducing ferrocene and adding graphene into the amorphous network. [50][51][52] More importantly, carbon-rich SiOC ceramics possess controllable dielectric properties, increasing SiC nanograins in SiOC ceramic, which results in enhancing the EMI absorbing capability of the SiOC ceramic. 51 As a typical magnetic material, Fe is an excellent candidate for EMI absorbing material.…”

“…[50][51][52] More importantly, carbon-rich SiOC ceramics possess controllable dielectric properties, increasing SiC nanograins in SiOC ceramic, which results in enhancing the EMI absorbing capability of the SiOC ceramic. 51 As a typical magnetic material, Fe is an excellent candidate for EMI absorbing material. However, since the Fe-based nanoparticles may lose their magnetism at high temperature, the incorporation of Fe-based nanoparticles into SiOC ceramics is not a good choice for achieving high temperature-resistant EMI absorption materials.…”

Carbon Nanofibers Propped Hierarchical Porous SiOC Ceramics Toward Efficient Microwave Absorption

“…As shown in Additional file 1: Figure S5, the real and imaginary parts of complex permeability are nearly equal to 1 and 0, respectively, which is ascribed to the non-magnetism of HPSCs. Figure 5c shows a comparison of RL min value versus thickness of similar Si-based ceramics materials in recent studies [12][13][14][29][30][31][32][33][34][35]. Additional file 1: Table S1 lists the detailed MA data of all related references.…”